Bagmaking machine



Nov. 2, 1943. A. POTDEVIN BAG MAKING MACHINE s Sheet s-Shee t '1 FiledJan. 17, 1-940 I ma INVENTOR W dZZr/a ATTORNEYS Nov. 2, 1943. A.POTDEVIN BAG MAKING MACHINE 3 Sheets-Sheet 2 Filed Jan. 17. 1940 m Q vfm INVENTOR ATTORNEYE s 5 Nov. 2, 1943. A. PCSTDEVIN BAG MAKING MACHINEFiled Jan. 17, 1940 INVENTQR Wm ATTO RN EYS Patented Nov. 2,- 1 9432.333.440 BAGMAKING moms Adolph Potdevin, Garden City, N. Y., assignorto Potdevin Machin e Company, Brooklyn, N. Y., a

corporation of New York Application January 17. 1940, Serial No."314,222

a 6 Claims. This invention is directed to the making of bags, and ismore particularly directed to the makings of bags wherein, when desired,the'bag is heat sealed before bottoming. This method is particularlywell adapted for use in connection with the making of bags fromcellulose acetate,

cellulose hydrate, glassine and the like, in that theapplication of heatto such materials enables the same to be fused for the purpose-ofproviding a heat seal.

Each (if these rollers carries a cutting knife 8 which cooperates with aplate It slidably carried by the former plate. The function of themembers 8 and III ispartially to divide the tubing 2 into bag lengthstransversely of the tubing, as shown at l2 and I4 in Fig. 7. During theoperation of the members-8 and III the leading portion of the tubingextends between the rollers l8. As the tubing advances beyond therollers More specifically the present invention provides apparatus formaking bags, wherein the,

ous through the machine it is tubed and divided into bag lengths toprovide a paste lip at the end to be bottomed. When desired the end tobe bottomed may be heat sealed before bottoming, and the open end of thebag length trimmed. The finished bags are stacked as they are dischargedmaking material moves forward continufrom the end of the machine,

The accompanying drawings illustrate one form of apparatus suitable for;practicing my invention.

Fig. l is a somewhat diagrammatic view in elevation of the entiremachine;

Fig. 2 is a view similar to Fig. 1 but on a larger scalewith many of theparts in section; a

Fig. 3. is a plan-view taken substantially in the plane 3-8 of Fig. 2; I

Fig. 4 is a fragmentary view in partial section of the heat sealingmechanism;

Fig. 5 is a part sectional elevational view of the heatsealing andbottoming mechanisms;

Fig. 6 is a plan view of Fig. 5;

Fig.7 shows in plan, for purposes of illus-- tration, the several stepswhich may be involved in division of tubing into bag lengths;

.Fig. 8 shows a sealing;

Fig. 9 shows the bag length of Fig.8 in proc ass of being bottomed; andV Fig. 10 shows the completed bag.

Referring to the drawings in detail: The bag making material, celluloseacetate, cellulose hy-. drate and like material, may be taken from any:

suitable source of supply and is moved continuously forward through themachine- As it passes ,into, the machine adhesive is applied thereto sothat as it advances through the tubing mechanism it is formedinto atube. This is well-knownpractice, and has not been illustrated. Thetubed material, designated 2, continuously advances between a pair offorwarding rollers 4 and from thence to-a pair of rollers 6.

bag length in plan after heat from a supply roll, and as it advances I8it passes between rollers I8 and 20, the rollers I8 carrying cutters 22while the rollers are smooth faced The machine is sotimed' that when theperforated areas of the tubing reach a position between the rollers i8and 20, the cutters 22 will have rotated to operative position to cutthrough the tubing 2 at the edges, as shown at 24in Fig. 7, thereby tocomplete the severing or dividing operation. A bag length as thusprovided is shown-in Fig. 7 where it has been designated 28.

The next step in the-practice of my invention may be to trim thetrailing end of each bag length, it being apparent from the drawingsthat at this stage each end of the baglength is provided with aprojecting lip. The lip at the leading end, ,which is later to be usedas a paste lip, has been designated 21, the lip at the trailing end hasbeen designated 28. When the trailingend of each bag length is to betrimmed, I provide upper and lower driven shafts 28 and 30,respectivelygbeyond the rollers i8 and 20. The shaft 28 carries aplurality, of spaced discs 32 which in turn carry a trimmer plate orknife 34 pro- Jecting from the periphery thereof. The trimmer knifecooperates with the surface of an anvil cylinder 38' which is carried bythe lower shaft 30,

' to cut off or trim the'trailing end of a bag length when the samepasses between the discs and cylinders. In Fig. '7 I show the bag length28 I with the end 88, including the lip 28, severed or trimmedtherefrom. The discs 82 are adjustably secured to a disc 40 on the shaft28soas to permit of adjustment of the discs circumferentially to adjustthe trimmer knife, as will be under- '-stood. 1 i

When the trailing ends of bag lengths are trimmed as above outlined, Iprovide means for eflecting positive discharge of the trimmed o severedends 88 of. the baglengths. As will be seen from the drawings, theperiphery ofthe' anvil cylinder 88 is provided with a slot 42 extendinglongitudinally thereof. Within the cyl-' gthwise thereof below the,

inder and extending len slot 42 is a. rod 44. This rod carries a clampor gripper law 48 which extends radially of the eyi.

inder into the slot 42. One end of the rod 88 carries an arm 4e,provided with cam follower roller 80 which follows fixed cam 82. The cam82 is set so that with the parts as shown in Fig. 2 the gripper 48 isclosed by spring 8!. On rotation of the cylinder 38 through an angle ofabout 180 the gripper jaw 18 will open.

The discs 32 above referred to carry a tucker plate 88 which trails thetrimmer blade :4,

plate providing for tucking the material of the assa-iso 84, abovereferred to. This cylinder is provided in its periphery with alongitudinal slot 98. Extending into this slot is a'movable gripper Jaw88, closed by a fixed cam I and opened by a spring I02. The movable jaw88 cooperates with a fixed Jaw I04.

' As above pointed out,'the plates" which lie beside the plates 88project slightly beyond the trailing end of the bag length between thegripper it and the side of the slot l2, so that as the piece 08 istrimmed off the trailing end of the bag, this piece will be gripped tothe cylinder 38 and becarried around with it for about a half 'turn,when the gripper opens, leaving thevpiece 38 free-to fall out bygravity. Further to insure that the trimming 38 will leave the cylinder'88 as the gripper 48 opens, I provide a rotary brush 88 ad- Jacent tothe bottomof the cylindet. This brush is rotated oppositely to and incontact with, the

cylinder I8 so as to brush the trimmings 08 from the cylinder, as willbeapparent.

Beyond the trimming mechanism are a pair of transfer rollers 80, the baglengths passing between these rollers, then across a plate 82 intoposition to be picked up by the mechanism which transfers the baglengths to bottom clamp cylinder 8|, this mechanism being so constructedthat the bag lengths -can be heat sealed,when desired before bottoming,

Referringto this mechanism, 84 designates a driven shaft extendingtransversely of the machine. Fast-on this shaft, adjacent the endsthereof, are a pair of rotors 88. Extending from' the ends of one rotorto the en of the other rotor are plates 88 capable of be! g electricallyheated. The commutator and b'rushes'for th se plates "are designated I0and 12, respectively. Cooperating with the outer face of each hot plateor heating element is a clamping and presser jaw I4. Each presser jawiscarriediby. a rock shaft I8. Each of these rock shafts carries arms I8and 80. Each arm 18 carries a cam follower roller 82 which cooperateswith an internal, fixed cam 84, for closing the jaws I4. The arms 80carry springs for opening the laws. Beside each heating elementis aplate 8.8 proiecting:

slightly beyond the outer face of each heating element. The outer faceof each plate -88 is knurled, as illustrated at 00, and, if desired, the

\ face of each jaw-I8. Y

The machine is so timed that, as the leading end of "each bag lengthpasses beyond the plate 82 in the forward advance of the ba length oneend of therotors as with the jaw 14 and plcte 88 in open position willbe. rotated into position so that the end of the bag length will enterbeface of the same, so that when the clamped end of the bag length comesup to the'bottom clamp cylinder 84, the material of the bag length Justto the rear of the clamping jawll will be tucked by the plate 88 betweenthe gripper 88 and fixed jaw I04, the presser' Jaw I4 opening at thesame instant, thereby to transfer the bag length to the bottom clampcylinder 84.

The past paste-applying bar I08 receiving its paste from past? rollerI08, this bar applying a stripe of paste I I0 to the bag lengthtransversely thereof. As'the rotating bottom clamp cylinder advances,the bag length, clamped to the cylinder 84 to the. rear of its leadingend H2, is carried .around until the gripper 88 is about abreast of thedriven bottom folding roller Ill, whereupon the end of the bag length isreleased and passes between this roller and fingers II8, the latterbeing' mounted on a bar II8 extending transversely of the machine. Asthe end of the bag length passes under the roller Ill theturnedbaolr'end II2 of the bag length including the paste lip 2'Iwill bepressed down upon'the ad- I hesive stripe 0. The line along which theturned-back end I I2 is foldedis designated II! in Fig. 8. The bottomedbag length then passes between delivery roller I20 which forward thesame to delivery cylinder I22.

The delivery cylinder I22 is provided with a plurality of grippers I24,each of which is camopened and spring-closed, by cams I28 and springsI28, respectively]; The bag lengths are advanced, by the rollers I20previously men-' ti0ned,-along the plate I30, and as the end of eachlength projects beyond the plate it is gripped The gripper cylindercarries the bottomed bag lengths to the deliveryv by one'of the grippersI24.

station I02 where the bags are stacked in a stack I88. A finished bag isillustrated in Fig. 10

' where it has been designated I38.

tween the jaw and plate, and the Jaw will close under the action of thecam 04, to attach the bag length to the rotors. If the bag length is tobe heat sealed the circuit tothe plate 08 is closed so that the materialof the bag length as it is transferred to the bottom clamp cylinder 84,suspended from the rotors, is heated .and fused to provide ,a heat seal82 across the bag length,-as seen'ln Fig. 8, where the plate 88 contactsthe material of the bag length. While good results :are obtainedif theface of the plate 80 and/or the face of the law-H be smooth, even betterresults are obtained if either or both of these facesbe knurled.

Each baglength 28 suspended from the rotors is moved forward forabout ahalf 'turn' of the rotors 88 until picked up by the bottom clampcylinder trimming the trailing end of each bag length, heatsealingmechanism for heat sealing the opposite end of each bag length, andbottoming mechanism for bottoming the heat sealed ends of "the baglengths, the'heat sealing mechanism delivering the heat-sealed baglengths to the bottoming mechanism.

2Q Bag making apparatus comprising mechanism for dividing bag makingmaterial into bag lengths, forwarding mechanism for the bag lengths,heat sealing mechanism'fo'r heat sealin the fiat unfolded leading end ofeach bag length as the bag lengths are in transit, said heat sealingmechanism comprising a pair of rotors carrying a hot plate, gripper lawsfor gripping the flat unfolded leading end of each bag length at thearea bag length is carried by the cylinder 84 to be heat sealed, andpressing the same against the hot plate for sealing the opposed walls ofthe bag length to each other, and bottoming mechanism for picking up thesealed bag lengths from the sealing mechanism at the sealed end.

3.-Bag making apparatus comprising mecha-' the area to be heat sealed,and clamping thesame against the hot plate for the sealing operation,and bottoming mechanism for picking up the heat-sealed bag lengths fromthe heat sealing mechanism.

4. Bag making apparatus comprising mechanism for dividing bag makingmaterial into bag lengths, forwarding 'mechanism for the bag lengths,heat sealing mechanism for heat sealing one end of each bag length intransit, said heat sealing mechanism comprising a hot plate, gripperjaws for gripping the end of each bag length at thearea to be heatsealed and clamping the same against the hot plate for the sealing operation, means for advancing the sealed bag length, and bottoming mechanismfor picking up the heat-sealed bag lengths from the heat'sealing'mechanism at the heat-sealed ends of the bag lengths.

5. Bag making apparatus comprising mechanism'for dividing bag makingmaterial into bag lengths, forwarding mechanism for the bag lengths, abottoming cylinder, means for delivering the bag lengths from theforwarding mechanism to the bottoming "cylinder, said-means comprising va pair of rotors, gripper Jaws carried tion on said shaft and afiixedthereto, so as to thereby, said jawscomprising a fixed jaw and a movablejaw, a cam for positively actuating said movable Jaw, a plate lyingbeside the fixed jaw adjacent the jaw opening, said jaws as the rotorsare actuated carrying the leading end of the bag lengths to thebottoming mechanism with each bag length suspended from the rotors bysaid jaws, gripper jaws carried by the bottoming mechanism, saidfplatetucking the bag lengths into said last mentioned gripper jaws totransfer the bag lengths to the bottoming mechanism as the firstmentioned gripper jaws are automatically' opened.

6. In bag making apparatus comprising mechanism for forwarding baglengths and bottoming mechanism, t'ransfer mechanism for transferringthe bag lengths from the forwarding mechanism to the bottomingmechanism, said transfer mechanism comprising in combination a shaftextending parallel to the axis of rotation of the bottoming mechanismyapair of rotors in spaced relarotate therewith, a pair of gripper jawscarried by said rotors and extending transversely of the machine fromthe outer end of one rotor to the outer end of the other rotor, cammechanism for i operating said jaws as the end of a bag length comes upto the transfer mechanism, thereby to grip the bag length at its leadingend to suspend the bag lengths successively. from the rotors, andgripper jaws carried by the bottoming -,mechanismadapted to receive andgrip the leading end of each bag length to the rear of they saidpreviously gripped portion of the bag as the rotors bring the sameadjacent the bottoming mechanism, thereby to-eflect transfer of the bag

